1
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
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The frequency of revolution of the electron in Bohr's orbit varies with n, the principal quantum number as:

A

$ \frac{1}{n^4} $

B

$ \frac{1}{n^2} $

C

$ \frac{1}{n^3} $

D

$ \frac{1}{n} $

2
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Earth has mass 8 times and radius 2 times that of a planet. If the escape velocity from the earth is 11.2 km/s, the escape velocity in km/s from the planet will be:

A

8.4

B

11.2

C

5.6

D

2.8

3
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following phenomena cannot be explained by wave theory of light?

A

Refraction of light

B

Reflection of light

C

Diffraction of light

D

Compton effect

4
JEE Main 2025 (Online) 28th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A body of mass 4 kg is placed on a plane at a point $P$ having coordinate $(3,4) \mathrm{m}$. Under the action of force $\overrightarrow{\mathrm{F}}=(2 \hat{i}+3 \hat{j}) \mathrm{N}$, it moves to a new point Q having coordinates $(6,10) \mathrm{m}$ in 4 sec . The average power and instanteous power at the end of 4 sec are in the ratio of :
A

4 : 3

B

13 : 6

C

1 : 2

D

6 : 13

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